C4.4 and C6.6 Industrial Engines and Engines for Caterpillar Built Machines Caterpillar

The engine can have a digital throttle that uses a Pulse Width Modulated (PWM) signal, an analog throttle or a multi-position switched throttle. The Electronic Control Module (ECM) must be programmed for the type of throttle input that is being used.

Table 1

Throttle 1	Throttle 2
PWM (Digital Throttle)	Analog Throttle
PWM (Digital Throttle)	None
PWM (Digital Throttle)	Multi-position Throttle Switch
Analog Throttle	Analog Throttle
Analog Throttle	None
Analog Throttle	Multi-position Throttle Switch
None	Analog Throttle
None	None
None	Multi-position Throttle Switch
Multi-position Throttle Switch	Analog Throttle
Multi-position Throttle Switch	None

The throttle is set up using the electronic service tool. From the menu, select "Services". On the "Services" screen, select "Throttle Configuration". Select the type of throttle from the following list:

• No throttle

• Analog throttle

• PWM throttle

• Multi-position throttle switch

Illustration 1	g01785156
Typical Range of Throttle (1) Lower Diagnostic Limit (Default=5) (2) Lower Position Limit (Default=10) (3) Initial Lower Position (Default=20) (4) Idle Validation Minimum Off Threshold (Default=21) (5) Idle Validation Maximum On Threshold (Default=25) (6) Lower Dead Zone % (Default=8) (7) Upper Dead Zone % (Default=5) (8) Initial Upper Position (Default=70) (9) Upper Position Limit (Default=85) (10) Upper Diagnostic Limit (Default=95)

PWM throttles require additional programming. If a multi-position switch is selected, additional parameters must be programmed. Refer to the Troubleshooting Guide, "Multiposition Switch Setup". If an analog throttle is selected, the following parameters must be programmed into the ECM.

Idle Validation

All analog throttles on mobile applications require an idle validation switch. If this parameter is programmed to "Yes", the ECM will look for this switch input on pin J1:45 for Idle Validation Switch 1 (IVS1) and J1:44 for Idle Validation Switch 2 (IVS2).

Table 2

Values	Default
No Yes	Yes

Idle Validation Minimum Off (Open) Threshold

This is the minimum throttle percentage that will be detected by the ECM when the IVS is ON (Closed).

If the ECM detects a throttle percentage below this value with the idle validation switch OFF (Open), a fault code will be generated and the engine will remain at idle.

Refer to Table 3 and Table 4.

Table 3

Throttle Position Sensor (TPS)	Idle Validation Switch (IVS)	Throttle Demand Output	Fault Status	Comment
TPS< IVS Min OFF	OFF	Minimum Position	Raise missing idle	Force throttle demand to minimum
TPS< IVS Min OFF	ON	Throttle Position	Clear missing idle	Normal operation

Table 4

Range	Default
0 to 100%	21%

Idle Validation Maximum On (Closed) Threshold

This is the maximum throttle percentage that will be detected by the ECM when the idle validation switch (IVS) is OFF (Open) . When the idle validation switch is OFF (Open) and the ECM detects a signal that is higher than the programmed value for IVS Max ON, the ECM will generate a fault code and the engine will remain at idle.

Refer to Table 5 and Table 6.

Table 5

Throttle Position Sensor (TPS)	Idle Validation Switch (IVS)	Throttle Demand Output	Fault Status	Comment
TPS> IVS Max ON	OFF	Throttle Position	Clear unexpected idle	Normal operation
TPS< IVS Min Off	ON	Minimum Position	Raise unexpected idle.	Force throttle demand to minimum

Table 6

Range	Default
0 to 100%	25%

Lower Diagnostic Limit

This is the minimum throttle percentage that should be detected by the ECM in normal operation when the pedal is in the "off" position. A value below this limit will generate a short circuit diagnostic code. The range of this diagnostic detection area is from 0 percent to the programmed value for the lower position limit.

Table 7

Range	Default
0 to 100%	5%

Upper Diagnostic Limit

This is the minimum throttle percentage that is detected by the ECM in normal operation when the pedal is in the maximum position. A value above this limit will generate an open circuit diagnostic code. The range of this diagnostic detection area is from the programmed value of the upper position limit to 100 percent.

Table 8

Range	Default
0 to 100%	95%

Lower Position Limit

This is the minimum throttle percentage that will be interpreted by the ECM as zero throttle. This parameter is used with the value of initial lower position limit to make an allowance for manufacturing tolerances between different pedals.

Table 9

Range	Default
0 to 100%	10%

Upper Position Limit

This is the maximum throttle percentage that will be interpreted by the ECM as full throttle. This parameter is used with the value of the initial upper position limit to make an allowance for manufacturing tolerances between different pedals.

Table 10

Range	Default
0 to 100%	85%

Initial Lower Position Limit

This is the maximum throttle percentage that will be interpreted by the ECM as zero throttle. This parameter is used with the value of the lower position limit to make an allowance for manufacturing tolerances between different pedals.

Table 11

Range	Default
0 to 100%	20%

Initial Upper Position Limit

This is the minimum throttle percentage that will be interpreted by the ECM as full throttle. This parameter is used with the value of the upper position limit to make an allowance for manufacturing tolerances between different pedals.

Table 12

Range	Default
0 to 100%	70%

Lower Dead Zone

This is a throttle range above the initial lower position limit before the engine will increase in rpm.

Table 13

Range	Default
0 to 100%	8%

Upper Dead Zone

This is a throttle range that is below the initial upper position limit that does not allow the engine speed to increase.

Table 14

Range	Default
0 to 100%	5%